/**
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								 * Copies the values of `source` to `array`.
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								 *
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								 * @private
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								 * @param {Array} source The array to copy values from.
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								 * @param {Array} [array=[]] The array to copy values to.
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								 * @returns {Array} Returns `array`.
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								 */
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								function copyArray(source, array) {
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								  var index = -1,
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								      length = source.length;
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								  array || (array = Array(length));
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								  while (++index < length) {
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								    array[index] = source[index];
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								  }
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								  return array;
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								}
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								module.exports = copyArray;
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